Many factors impact upon how long your electric bike battery will last on a single charge. Road conditions, use of gears, rider height and weight, and speed all impact the battery life. Because these factors are out of our control once the bike leaves the shop, we cannot guarantee an approximate mileage, however all of our electric bikes will have enough battery to get to Sausalito. And you can always call the shop if your battery is running low and we can assist you.